Improvement in tojtallic packings for piston-rod



l J. C. FURNESS. tallic Packing for Piston-Rods, &c.

Patented May 618i3.

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@Mg/ffm y UNITED STATES JAMES O. F URNESS,

IMPROVEMENT-.IN MLTALLIC PACKINGS FOR PiSTON-ROD Specification forming part of Letters Patent No. 138,627, dated May 6, 1873; applicati November ll, 1872.

To all whom it may concern.'

Be it known that I, JAMES C. FURNEss, of Boston, in the State of Massachusetts, have invented certain Improvements in Metallic Packing for Piston-Rods, 85o.; and I do hereby declare the following to be a full and correct description of the same, reference being had to the accompanying drawing, in which- Figure lis a plan of a packing-box containing metallic packing shaped and placed in the box according to my invention. Fig. 2 is Va sectional elevation of the same. Fig. 3 is a plan of two pieces of Babbitt metal forming a layer of packing. Fig. 4 is asectional elevation of two entire rings which may be used together for a packing. Fig. 5 is a sectional 'elevation of one of four rings which may be used together for a packing. Figs. 6 and 7 are plans of single rings, each of which is so broken that it may be used by itself as a perfect packing.

A is the packing-box, to be secured to the steam cylinder or pump in the ordinary manner. a. and b and c and d are pieces of Babbitt metal forming two packing-rings. Each ringis broken, as shown inFig. 3, and the two rings are placed within the box, asshown, so as to break joints, the dowel-pin a: preserving this arrangement. 'Ihe two pieces for each ring are considerably open or apart, to allow for wear in the cylindrical spaces as they press against the piston-rod; but the peculiar manner in which each ring is broken, in combination with the other ring, forms at each break a perfect steam-joint.

The several pieces forming the two rings are made to press against the piston-rod by means of steam, which fills the space z back ofthe pieces of metal and forces them inward against the piston-rod. The steam enters the space z through small holes in the ringplate, (not shown,) which separates the interior of the packingbox from the interior of the steamcylinder. The steam also exerts its force against the lower or nea-rer surface of the ring, which is nearer to the apertures for the entrance of the steam, as in the packing-box den BOSTON, MASSACHUSETTS.

PATENT OE scribed in my application for a pending before the Patent Office.

When steam is not up the seve al pieces of metal are kept from getting out f place by springs s, as shown, and this is t e of all the rings and pieces of metal herein l` scribed.

Two entire rings maybe used, wi hout breaking, to form a perfect packing, shown in Fig. 4, each ring being thicker t one side than at the other, as shown. Th Vare placed ve the relwithin the packing-box so as to i ative positions shown in Fig. 4; a l the steam in the space z, acting upon the ick part of the rings with more force than u on the narrow partthat is, having a large surface ups which to exert itself--causel the corresp fling interior part of each r1 g to press against the pistonlrod. i g

Instead, however, of having bo rings of a varying thickness, as shown in 4, one ot' them may be of the same thickn lss throughout', like the ring shown in Fig. 5, he dat side of the unequal ring being in cont ct with the uniform ring.

As before stated, Figs. 6 and each of which is broken so as to rm perfect steam-joints at the breaks. In e ch ring the part u fits over the part marked Z In each of these single rings-the two piece 1 are a little apart when new, and are presse against the rod, as they wear away, by steam mitted behind them in the space z. i

Strong `springs might be use t instead of steam, with all the rings descr' ed herein 5 and such strong springs might occupy the places of the light springs, which n all cases, I have represented as being use to keep the pieces of Babbitt metal in place. When such strong springs are used, a good l cking may be made of four rings, like the `e shown in Fig. 5.

I claimi l 1. The metallic packing, her nbefore described, formed of the two ring" a b and c d, made of Babbitt metal, as stat, each ring being broken, and said rings be g arranged within the packing-box A so as n1 are rings,

as shown in Figs. 1, 2, and 3, and remain steam-tight, the entire packing being rendered effective by steam-pressure, substantially as described.

2. A metallic packing formed of two unbroken rings, made by dividing a` cylinder on a plane oblique to its axis, as shown in Fig. 4, so that each of said rings shall have a thin and a thick side, as shown, against the latter of which sides the steam can act, as and for the purpose set forth.

3. The springs z in packing-boxes in which the Babbitt metal is to be made effective by steam to keep the pieces of metal substantial- 1y in place when not in operation.

The above specification of my said invention signed and witnessed at Boston.

JAMES (l. FURNESS.

Witnesses:

WILLIAM W. SWAN, F. M. HERMANN GIEFFERs. 

